如何在连续写入的日志文件的每一行中添加日期字符串 [英] How to add date string to each line of a continuously written log file

问题描述

有一个长时间运行的程序，该程序连续写入日志文件-怎么可能不考虑任何缓冲问题，而使用linux脚本在写入该文件的每一行中添加一个日期字符串呢?

Having a long running program that continuously writes to a logfile - how is it possible, disregarding any buffering issues, to add a date string to each line written to that file using a linux script?

我会想像这样的东西:

tail -f logfile | ADD_DATE_TO_EACH_LINE > logfile2

输入内容如下:

abc
def
ghi
jkl

输出应类似于以下内容:

The output should be similar to that:

2011-06-16 18:30:59 abc
2011-06-16 18:31:00 def
2011-06-16 18:35:21 ghi
2011-06-16 18:40:15 jkl

推荐答案

使用perl:

command 2>&1 | perl -pe 'print scalar(localtime()), " ";'

使用gawk:

command 2>&1 | awk '{ print strftime(), $0; fflush() }'

对于您的特定示例，将command替换为tail -f logfile.或者，也许您可​​以将原始程序的stdout/stderr重定向到上述管道.

Replace command with tail -f logfile for your specific example. Or, perhaps you could just redirect the original program's stdout/stderr to the above pipe.

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